21331544513313 has 16 divisors (see below), whose sum is σ = 28485148574720. Its totient is φ = 14199498263376.

The previous prime is 21331544513303. The next prime is 21331544513317. The reversal of 21331544513313 is 31331544513312.

It is not a de Polignac number, because 21331544513313 - 2²¹ = 21331542416161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21331544513317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4822356 + ... + 8119002.

It is an arithmetic number, because the mean of its divisors is an integer number (1780321785920).

Almost surely, 2^{21331544513313} is an apocalyptic number.

It is an amenable number.

21331544513313 is a deficient number, since it is larger than the sum of its proper divisors (7153604061407).

21331544513313 is a wasteful number, since it uses less digits than its factorization.

21331544513313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3299916.

The product of its digits is 194400, while the sum is 39.

Subtracting 21331544513313 from its reverse (31331544513312), we obtain a palindrome (9999999999999).

The spelling of 21331544513313 in words is "twenty-one trillion, three hundred thirty-one billion, five hundred forty-four million, five hundred thirteen thousand, three hundred thirteen".